Question

1. what is the sum? decompose both addends to solve.

a. $149 + 362 = ?$
b. add hundreds: $\underline{\quad} + \underline{\quad} = \underline{\quad}$
add tens: $\underline{\quad} + \underline{\quad} = \underline{\quad}$
add ones: $\underline{\quad} + \underline{\quad} = \underline{\quad}$
c. add partial sums: $\underline{\quad} + \underline{\quad} + \underline{\quad} = \underline{\quad}$

Explanation:

Step1: Decompose addends

$149 = 100 + 40 + 9$, $362 = 300 + 60 + 2$

Step2: Add hundreds place

$100 + 300 = 400$

Step3: Add tens place

$40 + 60 = 100$

Step4: Add ones place

$9 + 2 = 11$

Step5: Sum partial results

$400 + 100 + 11 = 511$

Answer:

a. $149 = 100 + 40 + 9$, $362 = 300 + 60 + 2$
b. Add hundreds: $100 + 300 = 400$; Add tens: $40 + 60 = 100$; Add ones: $9 + 2 = 11$
c. Add partial sums: $400 + 100 + 11 = 511$
Final sum: $511$